An air quality alert has been issued for west-central Florida, including the St. Petersburg area, due to elevated levels of PM2.5 pollution. The Environmental Protection Agency (EPA) has classified the air quality as 'unhealthy for sensitive groups,' advising residents to remain indoors. PM2.5 particles, which are smaller than 2.5 micrometers, can deeply penetrate the lungs and bloodstream, potentially worsening respiratory and cardiovascular health. Sensitive groups like children, the elderly, and those with respiratory conditions are particularly at risk.